Stability of Superalloys Doped with Rare Earth Elements

Abstract:

The stability of the microstructure and properties of the iron superalloys of the secondgeneration IN 519 (24% Cr, 24% Ni, 1.5% Nb) modified with 0.1 and 0.2 [wt.%] rare earthelements was investigated. The alloys underwent annealing at 825 oC for 10, 100 and 1000 h. Thefollowing techniques were used to evaluate the phase transformation: X-ray diffraction on crosssectionand isolates extracted from the as-cast and annealed alloys, microstructure analysis byoptical microscopy, hardness measurements by Brinell and nanoindentation with a Berkovich tipmethod. The analysis of changes in hardness distribution due to thermal processing of superalloyswas conducted with respect to the average hardness of matrix and phase precipitates.

• Periodical: Key Engineering Materials (Volume 586)
• Pages: 141-145
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.586.141
• Online since: September 2013
• Authors: Walenty Jasinski, Paweł Zawada
• Keywords: Microstructure, Phase Composition, Rare-Earth Metals, Superalloy

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